As well known, wire arc additive manufacturing (WAAM) processes having many advantages concerning the high deposition rate in comparison to powder bed processes, which leads to faster manufacturing and consequently a reduction in costs. Also, WAAM offers a great economic potential in the repair of worn components such as rollers, dies or tools. In comparison to other arc processes, the plasma gas constricts the (transferred) arc, which leads to a high concentrated energy input. This leads to advantages for the process, but can also be challenging in the area of high-strength steels. Thus, an understanding of the heat input and the resulting consequences such as transient temperature distribution, transformation, stress, distortion is of great importance for the application. Here, simulation provides important data for the additive manufacturing, but the used parameters and models have to represent the process very well.